And michael neil



(No Model.)

1). W. NORRIS & M. NEIL.

SCREW JA K. No. 298,704. Patented May 13, 1884.

' tlivrTnn STaTns PATENT Orrrcs.

DANIEL IV. NORRIS, OF ELGIN, ILLINOIS, AND MICHAEL NEIL, OF DAYTON,OHIO; SAID NORRIS ASSIGNOR TO SAID NEIL.

SCREW-JACK.

SPECIFICATION forming part of Letters Patent No. 298,704, dated May 13,1884'.

Application filed April 4, 1884. (No model.)

T to whom it may concern:

Be it known that we, DANIEL W. NORRIS, of Elgin, in the county of Kaneand State of Illinois, and llIIOHAEL NEIL, of Dayton, in the county ofMontgomery and State of Ohio, have invented certain new and usefulImprovements in Screw-Jacks, and we do hereby declare the following tobe a full, clear, and exact description of the same, reference being hadto the IQ accompanying drawings, forming a part of this specification,and to the figures and letters of reference marked thereon.

Our invention relates to that class of screw jacks and clamps in which adivided nut is employed in connection with a screw-shaft;

and it consists, particularly, in certain improved means for effectingthe engagement and disengagement of the parts of the divided nut to andfrom the screw-shaft, as will be hereinafter fully described andclaimed.

Referring to the accompanying drawings, a

Figure 1 represents a sectional elevation of a screw-jack embodying ourinvention; Fig. 2, a cross-sectional view of the same, taken on the lineat :0, Fig. 1; Fig. 3, a detail view of a portion of the sectional nut;Fig. 4, a detail view of the sleeve which co-operates with the nut toopen and close the same. Figs. 5 and (3 are modifications of ourinvention; Fig. 7, a view showing the application of our improvement toa screw-clamp.

Similar letters of reference in the several figures indicate the sameparts.

The-letter A designates the standard of a screw-jack; B, the shaftthereof, carrying at its upper end the head 13. v C O 0 represent theparts of which the divided nut is composed. Though three parts areshown, two or more than three may be em- 40 ployed, if desired. Theinterior of each of the sections 0 is screw'threaded to correspond tothe thread of the screw-shaft, while the exterior of each of saidsections is made sloping,as shown. IVhen all the sections areunited,their proximate edges abut against each other, and as a wholethey present the appearance of a frustum of a cone, as shown in Figs. 1and At their joints or abutting edges the sections are provided withwedge-shaped slots or reoesses 1), extending longitudinally ofthe'sections to a greater or less extent, but preferably to about theextent shown in Fig. 3, and by preference they are doweled together, asseen at (I, so as to insure their simultaneous motion longitudinally.When in working po- 5 5 sition, the parts of the sectional nut rest withtheir bases against the inner wall, E, of the standard or casing A, andare surrounded by a ring or sleeve, F, also arranged within the casing,as shown in Fig. 1. This ring or sleeve is of conical or tapering formon the inside, and is adapted to normally fit against and supportlaterally the sectional nut. On its out side the ring or sleeve ispreferably cylindrical in form, and fits against thecorrespondinglyformed inner wall, a, of the standard or casing, and isadapted to slide in contact with said wall when moved longitudinally, ashereinafter more fully explained;

Formed upon or attached to the inner side of the ring or sleeve F are aseries of wedgeshaped projections, G, corresponding in number andposition to the wedge-shaped slots or recesses D in the nut-sections,and fitting therein, as shown in Fig. 2. 7

A suitable spring, H, preferably of helical or spiral form, is arrangedwithin the casing, and bears at one end upon the cap I, and at the otherend upon the ring or sleeve F, a suitable shoulder, f, being provided-onthe latter to receive it. hen in normal position, the parts of thesectional nut rest upon the wall E of the casing, the parts of the nutbe ing held together and in engagement with the screw-shaft by the ringor sleeve, and the hit ter being held by the force of the spring H. Thusarranged, the screw may be adjusted up or down within the nut by theapplication of any suitable device which will serve to rotate it. hen,however, it is desired to more rapidly adjust the screwshaftlongitudinally in either direction, it is only necessary to movelongitudinally the ring or sleeveFagainst the tension of the spring H,whereupon the wedge-shaped projections G on said ring or 5 sleeve willtravel along the wedge-shaped recess D in the nut-sections, and forcesaid sections apart sufficiently to disengage them from the screw-shaftand enable the latter to be moved to the pointdesired. Upon the releaseI00 of the sliding ring or sleeve the spring will assert itself, and byforcing the ring or sleeve against'the inclined exterior of thenut-seetions cause the latter to be again forced inward into engagementwith the shaft.

Any convenient means may be employed for moving the ring or sleeveagainst the tension of the spring. For instance, a thumbpiece orpush-pin, K, may be extended through v the,casing andconnected to thesaid ring or sleeve, as shown'inFig. 1.

In Fig. 5 we have shown a modification of our invention in which thedivided nut and its inclosing sleeve or ring are turned end for end, thedivided nut instead of the sleeve being allowed a longitudinal movement,and the spring being arranged to bear upon the divided nut instead ofupon the sleeve. In this modification, also, the parts of the nut aredoweled together after the manner shown in Fig. 2.

In Fig. 6 we have shown another modification, in which the parts of thedivided nut are adapted to be forced apart, either by the operation ofalongitudinally-moving wedge-shaped ring, M, or by a spring, N, or byboth of these instrumentalities operating together.

It is obvious that while our invention is especially applicable toscrewjacks it is also applicable to other machines or implements inwhich a screw shaft is required to be adjusted back and forth. In Fig. 7we have shown the application of our'invention to a screw-clamp. In thisembodiment we prefer to locate the push-pin. K, by which the ring orsleeve is moved, in a recess, L, or between flanges, so as to preventthe accidental or casual movement of said push-pin by the strikparts ofthe nut, so as to release the shaft.

3. Thecombination of a screw-shaft, a divided conical nut havingwedge-shaped recesses, substantially such as described, and an inclosingring or sleeve operating normally to keep the nut-sections in engagementwith the shaft, and provided with projections, substan tially such asdescribed, for opening the parts of the nut when the ring or sleeve ismoved longitudinally, substantially as described.

4. The combination of the screw-shaft, a

divided conical nut, an inclosing ring or sleeve for keeping the partsof the nut together and in engagement with the shaft, and a spring forholding the sleeve in position.

5. The combination of a screw-shaft, a divided conical nut having theWedge-shaped recesses, the inclosing-sleeve having the wedgeshapedprojections, and the spring.

6. The combination of the screw-shaft, a divided conical nut, theinclosingring, and means, substantially as described, for sliding thesaid inclosing ring or sleeve.

7. The combination of the screw-shaft, a divided conical nut, theinclosing-sleeve and the push-pin for sliding said sleeve, and thespring, substantially as described.

8. The combination,with the casing or frame of a screw jack or clamp, ofa screw-shaft, a divided conical nut, and an inclosing ring or sleeve,all arranged within the casing substantially as described.

9. The combination,with the casing or frame of a screw jack or clamp, ofa screw-shaft, a

divided conical nut, an inclosing ring or sleeve for forcing the partsof the nut together, a spring for holding the sleeve in position, andmeans, substantially as described, for moving the sleeve against thetension of the spring.

10. The combination, in a screw jack or clamp, of a screw-shaft, a frameor casing hav-. ing its inner lateral walls parallel, a screwshaft, adivided conical nut, and a ring or sleeve having its interiormadeconical to correspond to the divided nut, and its exterior formed tocorrespond to the parallel walls of the casing, substantially asdescribed.

11. The combination, in a screw jack or clamp, of a screw-shaft, a frameor casing having its inner lateral walls parallel, a divided conicalnut, and a ring or sleeve having its interior made conical to correspondto the divided nut, and its exterior formed to correspond to theparallel walls of the casing, a spring operating upon theinclosing-ring, and

the push-pinfor moving said ring against the tension of the spring.

12. The combination of a screw-shaft, a divided nut, a casing or holderwithin which the"

